Workaround deps2git issue with inline Python in DEPS.

When running
https://code.google.com/p/chromium/codesearch#chromium/tools/deps2git/deps2git.py
on our DEPS file, an error is caused by the formatting pretty printing
of the converted DEPS -> .DEPS.git output.
Since this needs to work in order to switch our bots to bot_update
(uses Git) and the fact that changing deps2git.py is high risk, it's
better to work around this problem by altering the Python inline code.
The fact that deps2git will go away when the remaining projects
have switched to Git also motivates not taking the risk of changing
deps2git for this case only.

BUG=3534
TESTED=Ran gclient runhooks and verified the script executed
when there was a trunk/check_root_dir.py file.

R=phoglund@chromium.org, phoglund@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/22999004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7417 4adac7df-926f-26a2-2b94-8c16560cd09d